Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29ac5aed4f6d136…

MALICIOUS

PDF

111.4 KB Created: 2021-03-19 09:23:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5efecfb39085f04f06cd0a94b42d488f SHA-1: ada7d6d6991b5d9ab9ba83c19d217ae918801092 SHA-256: f29ac5aed4f6d13681a803b1cd05aff6d1e503396645d3b96f567c8b106f0d7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a technique often used for SEO link farms or to redirect users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=sample+lab+report+chemistry+pdf
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/zejenowegebelumikaxo.pdf
    • https://radinake.weebly.com/uploads/1/3/1/8/131856095/1717434.pdf
    • https://bododomeliba.weebly.com/uploads/1/3/1/4/131408614/8030081.pdf
    • http://govovimifakine.mywebcommunity.org/cambridge_advanced_learner_dictionary_4th_edition.pdf
    • https://static.s123-cdn-static.com/uploads/4411250/normal_5fcf02d8db6fe.pdf
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5fd266e609efb.pdf
    • http://zutumufedige.getenjoyment.net/76915119468.pdf
    • https://static.s123-cdn-static.com/uploads/4366399/normal_5fe40e3553f7e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_d3794cb9e7124641995326ef3a978ab3.pdf?index=true
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_f34ebfa8ad56496fbe75fad4d75eb0ee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/19ed1506-9337-443f-b1b9-c50c8dcd5e68/black_and_decker_cordless_pole_hedge_trimmer_18v.pdf
    • https://uploads.strikinglycdn.com/files/f3cdc3dc-24e4-40a6-ab49-bc8941f31276/20421457601.pdf
    • http://liduvitulugug.onlinewebshop.net/ceilidh_music.pdf
    • https://uploads.strikinglycdn.com/files/21e4f6cd-4e54-473b-8f11-22b8e0f098fa/93715149574.pdf
    • https://uploads.strikinglycdn.com/files/5c943b3f-3e60-404b-87f2-1f1d5f372332/cost_to_repair_bose_wave_radio.pdf
    • https://uploads.strikinglycdn.com/files/651f3699-4a3e-4a71-978e-c5a35fcf973e/landwirtschafts_simulator_2015_ps3_cheats_mehr_geld.pdf
    • https://uploads.strikinglycdn.com/files/9e8a28c0-2221-46e0-b65c-b21ab0f1eb1c/wapedi.pdf
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_afb6f2895b5d474d8eb7d070b6b0ff38.pdf?index=true
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_f8f76c6c63f74a65bdc2fc158f038706.pdf?index=true
    • https://uploads.strikinglycdn.com/files/72d98653-1b11-4770-945d-2fc07027ed81/12850172116.pdf
    • https://uploads.strikinglycdn.com/files/f12b942a-b31c-4520-8e0b-bffbcee7641c/how_to_write_an_essay_about_personal_goals.pdf
    • https://uploads.strikinglycdn.com/files/406e7015-7b9a-4c88-b2b1-f9f7153a8912/83070897182.pdf
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_7ed9767fede842f1960023034479edf8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0f62d621-aca3-4002-b9cf-d49de6dbd884/16680626918.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015d55.bin
83e744e92b3243cbbeb9de52dd910875f21f7f2659c8618486d929a54609b385		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D55 5740 bytes
font_01_sfnt_off000170b1.bin
3dbcd58cdc3b70488e2c8b07263750bc0f79e5dad734af581eb075c20b6bdb40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170B1 12276 bytes
font_02_sfnt_off00019aa9.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19AA9 16204 bytes

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